Polystyrene-DVB (4%) copolymer beads is combined with anhydrous A1Cl3 and TiCl4 (1:1) in CS2 to form a stable complex containing 11.4% of chlorine

in which the ratio of the both metals is about 2:1 (Al/Ti = 2/1). It correspond to (6.42×10-4 mol A1Cl3 +3.21×10-4 mol TiCU)/l g. complex beads. The complex can be used to catalyze a lot of organic synthesis reactions in high yield

such as esterifications

acetalizations

ketal formations

etherifications and the Friedel-Crafts alkylations. The activity of PS-Al/Ti is greater than PS-AlCl3 and PS-TiCl4[4-7].It is important to note

that the complex PS-Al/Ti as a catalyst can be used repeate-dly with high yields.